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8 Structure of records and tables In general, the user requires no information on the structure o f records and tables when
defining a database by means of DDL and SSL.
This chapter is a reference chapter for users interested in particul ar details.
8.1 Structure of records
User-defined record
As a rule, the physical structure of a record defined in th e schema DDL comprises more
than the items specified for this record type. In most cases, set connection data (SCD) is
automatically added when a record is stored. The SCD can consist of the following
components:
– the pointers UDS/SQL requires for storing a set occurrence as a chain,
– the pointer from the owner to its associated pointer array or list,
– the pointer from the member to the associated owner, and
– an indication if the record is part of a SYSTEM s et.